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박경태,김승현,홍순익,최미선,조남찬,유환준,이종현,Park, Kyoung-Tae,Kim, Seung-Hyun,Hong, Soon-Ik,Choi, Mi-Sun,Cho, Nam-Chan,Yoo, Hwan-Jun,Lee, Jong-Hyeon 한국자원리싸이클링학회 2012 資源 리싸이클링 Vol.21 No.5
Zr은 고온에서의 높은 치수안정성, 내식성은 물론 낮은 중성자 흡수단면적을 지녀 원자력산업용 소재 중 1차 방사능 차폐재인 핵연료 피복관으로 사용되며 현재까지 다른 소재로 대체 불가능하다. 하지만 Hf을 정제한 Zr sponge 제조기술은 미국, 프랑스, 러시아만 가지고 있어 원자력의존도가 높은 한국에서는 국가전략물자로 분류 철저히 관리되고 있다. 국내 유통되는 Zr의 대부분은 원자력산업에 사용되어 지며 유통구조는 정제된 Zr합금을 국외로부터 수입하여 tube로 가공 후 핵연료집합체로 제조되고, 그 외 소량이 합금첨가원소 및 폭약재 등 고부가가치 일반산업에 사용된다. 본 논문에서는 Zr 제조기술에 대한 현재산업현황 및 정련기술을 살펴보고, 최근 연구되고 있는 Electrolytic reduction process와 Molten oxide electrolysis와 같은 신 제련기술에 대한 소개 및 Zr recycling의 전반적인 기술소개도 포함하였다. Zirconium is one of the most important material used as cladding of fuel rods in nuclear reactors because of its high dimensional stability, good corrosion resistance and especially low neutron-absorbing cross section. However, Hf free nuclear grade Zr sponge is commercially produced by only three countries including USA, France and Russia. So, Zr has been thoroughly managed as a national strategic material in Korea. Most of the zirconium is used for Korean nuclear industry as nuclear fuel cladding materials manufactured from Hf free Zr alloy raw material. Also, there are some other applications such as alloying element and detonator. In this review, zirconium production and recycling technologies have been reviewed and current industrial status was also analyzed. And recent achievements in innovative reduction technologies such as electrolytic reduction process and molten oxide electrolysis were also introduced.
스케일링 건강보험 급여화사업 이후의 스케일링에 관한 인식에 영향을 미치는 요인
이경희 ( Kyeong-hee Lee ),손지영 ( Ji-young Son ),이행옥 ( Haeng-ock Lee ),신송희 ( Song-hee Shin ),전현지 ( Hyeon-ji Jeon ),유환준 ( Hwan-jun You ),문선호 ( Seon-ho Mun ),김지연 ( Ji-yeon Kim ) 한국치위생학회 2017 한국치위생학회지 Vol.17 No.3
Objectives: The purpose of this study was to examine the recognition about scaling after health insurance benefit business for scaling by national health insurance corporation for the general public. Methods: In order to examine the recognition about scaling after health insurance benefit business for scaling by national health insurance corporation for the general public, study subjects were selected from those who are over 20 years old, living in Seoul and Gyeonggi province since December 2016. Among 300 selected subjects, data of 279 subjects were used for the analysis which is 93% of selected data, except 21 data with insufficient responses. Results: Results of examined factors affecting the recognition about scaling after health insurance benefit business for scaling by national health insurance corporation for the general public show that the recognition about scaling after national health insurance benefit is affected by female (p<0.05), past smoker (p<0.01), exercise more than 3 times a week (p<0.05) and 1-2 times a month (p<0.001) in order. Conclusions: It is necessary to prepare a plan to properly inform the national health insurance benefit for dental scaling and to raise the recognition about the necessity of scaling.